#include"bits/stdc++.h"
using namespace std;


int main() {
	string a,b;
	cin >> a >> b;
	map<char,int> ma,mb;

	for (int i = 0; i < a.length(); i++) {
		ma[a[i]]++;
		mb[b[i]]++;
	}
	bool F=true;
	for (auto itra = ma.begin(), itrb=mb.begin(); itra != ma.end(); itra++,itrb++) {
		if (itra->first != itrb->first) {
			F=false;
			break;
		}
		else {
			if (itra->second != itrb->second) {
				F=false;
				break;
			}
		}
	}
	cout << (F?"YES":"NO") << endl;
}